Supercomputers/Systems/Camphor 2
Japan · operational · hpc
Camphor 2
Also known as Kyoto University System A (2016)
Operated by Kyoto University ACCMS .
Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1092 of 1153 systems have a readable citation that names them, and 40 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.
Measured performance
- Rmax
- 3.06 PFlop/s
- Rpeak
- 5.48 PFlop/s
- Rmax ÷ Rpeak
- 55.8%
- Cores
- 122,400
- Power
- 748.1 kW
- Per watt
- 4.1 GF/W
Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.
What this machine is made of
One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.
| Role | Part | Supplier at build | Quantity | Confidence | Source |
|---|---|---|---|---|---|
| Integrator | - Cray XC40, 1,800 nodes | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Verified | top500.orgiimc.kyoto-u.ac.jp |
| Accelerator | Intel Xeon Phi 7250 (Knights Landing) Accelerators x86-64 (Knights Landing) · 68C · 1.4 GHz · 14 nm · 215 W Intel Xeon Phi 7250 68C 1.4GHz (Knights Landing), one per node | Intel | 1,800 reported | Verified | top500.orgiimc.kyoto-u.ac.jp |
| Interconnect | Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Cray Aries interconnect, dragonfly topology | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Verified | top500.orgiimc.kyoto-u.ac.jp |
The read
Kyoto University's 2016 System A: a Cray XC40 of 1,800 nodes, each a single 68-core Intel Xeon Phi 7250 at 1.4 GHz, on a Cray Aries dragonfly network with 230 TB of DataWarp. TOP500 lists 122,400 cores, 3.06 PFlop/s Rmax, 5.48 PFlop/s Rpeak and 748 kW; it debuted 34th in November 2016 and was still listed at 417th in November 2025. Kyoto's own page independently gives the XC40, 1,800 nodes, 5.48 PFlop/s peak, 196.9 TB memory and 15.75 GB/s node injection, but labels the specification as the 2016 to 2022 service period, which sits oddly with the TOP500 listing through 2025, so status is held at operational with the last observed list date. Camphor 3 (2023) is the successor and is already in this dataset. The machine room location is not named, so no site is recorded.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-02 Added Kyoto University's Camphor 2 Cray XC40
Source check
We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.
| Cited source | Result | Found on the page |
|---|---|---|
| top500.org | names system and part | Intel Xeon Phi 7250 (Knights Landing), Cray Aries |
| iimc.kyoto-u.ac.jp | names system, part and count | Intel Xeon Phi 7250 (Knights Landing), Cray Aries · counts: 1800 |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.
Inside a node
Why accelerators exist, what the memory hierarchy costs, and how the CPU and accelerator merged onto one package.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.